What is it? Can you ID this tool?Hot

The game is pretty simple. The other day I got this tool from a local yard sale—I know what it is, but do you? If you think you know, leave a comment below letting us know how smart you are. After you have made your guess, watch the video to see if you got it right.

1584 views
August 30, 2013
- 00:46

Can you identify this tool I got from a yard sale?

Add your guess to the comments below.
No cheating.
If you guessed a telescoping pocket pencil/ruler, you would be correct. It is sterling silver and very well made. There is very little play and the ruler marking are accurate.
Music: Hot Swing by Kevin MacLeod (incompetech.com)